USB2517 datasheet(27/58 Pages) MICROCHIP

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 2013-2016 Microchip Technology Inc.

DS00001598B-page 27

USB2517/USB2517I

7.2.1.12

7.2.1.13

Bit

Number

Bit Name

Description

7:0

PORT_DIS_BP

Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port is

available, ‘1’ = port is disabled.

During Self-Powered operation when remapping mode is disabled (PRT-

MAP_EN='0'), this selects the ports which will be permanently disabled, and

are not available to be enabled or enumerated by a Host Controller. The ports

can be disabled in any order, the internal logic will automatically report the

correct number of enabled ports to the USB Host, and will reorder the active

ports in order to ensure proper function.

When using the internal default option, the PRT_DIS_P[7:1] and

PRT_DIS_M[7:1] pins will disable the appropriate ports.

Bit 7= 1; Port 7 is disabled

Bit 6= 1; Port 6 is disabled

Bit 5= 1; Port 5 is disabled

Bit 4= 1; Port 4 is disabled

Bit 3= 1; Port 3 is disabled

Bit 2= 1; Port 2 is disabled

Bit 1= 1; Port 1 is disabled

Bit 0 is Reserved, always = ‘0’

Bit

Number

Bit Name

Description

7:0

MAX_PWR_SP

Max Power Self_Powered: Value in 2mA increments that the Hub consumes

from an upstream port (VBUS) when operating as a self-powered hub. This

value includes the hub silicon along with the combined power consumption

(from VBUS) of all associated circuitry on the board. This value also includes

the power consumption of a permanently attached peripheral if the hub is

configured as a compound device, and the embedded peripheral reports

0mA in its descriptors.

Note:

The USB 2.0 Specification does not permit this value to exceed

100mA.

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